@article{MM2_1985__53_155094,
     author = {Friedrich Sauvigny},
     title = {On the {Morse} {Index} of {Minmal} {Surfaces} in {IRp} with {Polygonal} {Boundaries.}},
     journal = {Manuscripta mathematica},
     pages = {167--198},
     publisher = {mathdoc},
     volume = {53},
     year = {1985},
     zbl = {0607.53004},
     url = {http://geodesic.mathdoc.fr/item/MM2_1985__53_155094/}
}